Section 2
DESCRIPTION
14
butterfly continues to open until the system vacuum
reaches approximately 15 in.-Hg. (381mm) at which
time the vacuum system is operating at full capaci-
ty.
NORMAL OPERATING MODE - 15 TO 20 IN.-HG.
(381 TO 508MM)
When the system vacuum rises above 15 in.-Hg.
(381mm), the inlet butterfly valve is opened and gas
is drawn from the system at full capacity of the vac-
uum pump. From this point on, the system vacuum
is continually monitored by a vacuum gauge. The
vacuum regulator remains closed during this phase,
keeping the Sullicon Control inactive.
MODULATING MODE - 20 TO 23 IN.-HG. (508 TO
584MM)
If less gas than the rated capacity of the vacuum
unit is being admitted to the system, the system
vacuum will rise above 20 in.-Hg. (508mm). The
vacuum regulator valve gradually opens, applying
atmospheric air pressure through the control line to
the diaphragm chamber of the Sullicon Control
which then partially closes the butterfly valve on the
vacuum unit inlet; reducing the amount of gas
entering the vacuum unit until it matches the
amount of gas being admitted to the system. The
Control System functions continually in this manner,
between the limits of 20 to 23 in.-Hg. (508 to
584mm) in response to varying demands from the
system.
DUAL CONTROL- ABOVE 23 IN.-HG. (584MM)
For a machine with varied periods of time when
there is not vacuum requirements, a "dual-control"
option is available. This option allows you to set the
machine in an automatic position whereby the
machine will shut down when no vacuum require-
ment is present and restart when the system vacu-
um decreases. This is accomplished through the
vacuum switch. When the system vacuum reaches
23 in.-Hg. (585mm), the switch contacts open which
de-engergizes the solenoid valve. Atmospheric air
pressure is admitted to the Sullicon diaphragm
which holds the butterfly valve closed.
Simultaneously, a timing relay starts. When the tim-
ing relay is satisfied, it will shut the vacuum system
down. When the lower setting 20 in.-Hg. (508mm)
of the vacuum switch is reached, the machine will
automatically restart.
2.7 INLET SYSTEM, FUNCTIONAL DESCRIPTION
The RSVS inlet system consists of a dry-type
inlet filter, a check valve and an inlet butterfly
valve.
The butterfly-type inlet valve directly controls the
Figure 2-4 Control System
KEY NO. DESCRIPTION QTY
1 VACUUM REGULATOR VALVE 1
2 SULLICON CONTROL 1
3 ORIFICE 1
4 CHECK VALVE 1
5 VACUUM PUMP 1
START
FULL LOAD
MODULATION
To Next Page
Loading...